Originally Posted by
GreenOne
The resons are basicly 2 imo:
1- Tormod kept their creatures small for a bit of time. It needed a couple turns at least to build a 7 card graveyard even with mental note. With Goyf in place of Werebear, the opponent can just keep any istant+ a fetch in play and make the Goyf a 2/3 instantly (which is bigger than any creature in the deck). Even istantly making a 1/2 goyf (with just a fetch in play OR instant in hand) can block every Lackey, Matron, Fanatic and even a Piledriver attacking alone.
2- Thresh-type decks adopted stifle as a staple MD card. So you can do savage tricks like attacking, letting him block with goyf, assign dmg, pop Relic and watch the goyf die as state based effect even if the opponent has a fetch and an istant in hand. But if the opponent plays a stifle he just 2 for 1ed you and you're probably screwed.